Sigyn is a goddess from Norse mythology. Her name means bringer of victory. She is the wife of Loki, with whom she has the sons Narfi and Ali, and is considered the symbol of marital fidelity.
Sigyn is mentioned in the Elder Edda (Völuspá 38), where she appears as sitting with her bound husband Loki.
In the prose addition of Lokasenna the incident is described in more detail:
Loki was bound by the gods with the entrails of his son Narfi, his other son Ali was turned into a wolf, and over Loki himself Skadi, in revenge, placed a serpent whose poison dripped into his face.
Sigyn now catches the dripping poison with a bowl. But when the bowl is full and she has to empty it, the poison drops hit Loki's face, causing him to feel tremendous pain. He screams so loudly that the earth trembles and earthquakes occur.
In the Younger Edda, Sigyn is introduced in Gylfaginning 31 as Loki's wife and mother of his son Narfi. In chapter 50 it is described how Loki, through the death of Balder, turns the other gods against him.
After an initial escape, they capture Loki and then his sons. They transform Ali into a wolf so that he tears his brother Narfi apart. Loki is tied to three pointed boulders with his intestines transformed into indestructible shackles, and Skadi attaches a snake over his head, whose poison drips into his face.
Sigyn tries to alleviate his suffering by catching the poison, as it is also described in the Elder Edda. This will continue until the twilight of the gods, when Loki will free himself from his bonds.